php - Changing a string in a json object

Question

I'm trying to update a json file and I'm using laravel command to do it. In that file there are specific product codes that need to be changed. The code I'm doing to do this isn't working, it runs but nothing changes.

Here is my code

$old_code = 'P001';
$new_code = 'P011';

$productJson = json_decode(file_get_contents(storage_path('/Product 1/product.json')));

foreach($productJson as $key => $value){
    str_replace($old_code, $new_code, $k);
}

file_put_contents(storage_path('/Product 1/product.json), json_encode($productJson, JSON_PRETTY_PRINT));

and this is my json file

{
    "P001": {
        "name": "Product 1",
        "price": "200",
        "category": "Shirts"
    },
    "P002": {
        "name": "Product Test",
        "price": "100",
        "category": "Tops"
    },
}

Answer 1

Its probably simpler to read the file and create a new JSON with the new codes like this

$s = '{"P001": {
  "name": "Product 1",
  "price": "200",
  "category": "Shirts"
},
"P002": {
  "name": "Product Test",
  "price": "100",
  "category": "Tops"
},
"P003": {
  "name": "Product Test",
  "price": "50",
  "category": "Bottoms"
}
}';
 
$old_codes = ['P001', 'P002' ];
$new_codes = ['P011', 'P022' ];

$productJson = json_decode($s);

$new = new stdClass;

foreach($productJson as $key => $json){
    $kk = array_search($key, $old_codes);
    if ( FALSE !== $kk ) { // found
        $new->{$new_codes[$kk]} = $json;
    } else {
        $new->{$key} = $json;
    }
}

echo json_encode($new, JSON_PRETTY_PRINT);

//file_put_contents(storage_path('/Product 1/product.json'), json_encode($new, JSON_PRETTY_PRINT));

RESULT

{
    "P011": {
        "name": "Product 1",
        "price": "200",
        "category": "Shirts"
    },
    "P022": {
        "name": "Product Test",
        "price": "100",
        "category": "Tops"
    },
    "P003": {
        "name": "Product Test",
        "price": "50",
        "category": "Bottoms"
    }
}